If you own this domain you can map it to your site by following the instructions below. If you don’t own this domain, go back and try another domain name.

So I clicked the 'start mapping my domain button' and I believe it charged me $13 on top of the $99 I already paid which says it includes domain mapping. I then clicked on the 'Cancel & refund button and it said:

@alyda21: it looks like you have two admins on your blog. If you log in as the other admin (who purchased the Bundle), you'll be able to use the free domain mapping credit that was included in the Bundle.